AgNO3 and NaOH were combined in the first reaction. If you were to use a scale to find the mass of the AgNO3 and the NaOH before they were combined, and then find the mass of the final compound(s) after the experiment, how would the masses compare?

TLDR: They should be the same by the conservation law of masses.

Now it may appear as if they changed if one of the resulting products is in the form of a gas or another hard to examine and weigh. In those situations it may seem that the masses will change, but the ratio should remain constant. Try looking up 3.7: Conservation of Mass - There is No New Matter on ChemLibre for more information on this topic that goes more into depth about it.

the atomic mass is the bottom number on the element.

-steel jelly

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.